Stir together Cheddar, mayonnaise, pimientos, cumin, chili powder, and cayenne in bowl.,Spread cheese mixture on 6 slices bread; top with zucchini and remaining bread slices.,______,Coat skillet or grill pan with cooking spray, and heat over medium heat.,Place panini in pan; weight with smaller-diameter saucepan weighted with 2 cans.,Cook 2 minutes.,Flip, replace weight, and cook 2 minutes more.,(Or cook 4 minutes in panini maker.)